XRT79L71 Datasheet, PDF (198/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L71
REV. P1.0.3
PRELIMINARY
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1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TXDS3 F-BIT MASK # 2 REGISTER (DIRECT ADDRESS = 0X1137)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
F_Bit Mask
[23]/UDL
Bit# 6 (C63)
F_Bit Mask F_Bit Mask
[22]/UDL
[21]/UDL
Bit# 5 (C62) Bit # 4 (C61)
F_Bit Mask
[20]
F_Bit Mask F_Bit Mask F_Bit Mask
[19]/DL
[18]/DL
[17]/DL
Bit # 3 (C53) Bit # 2 (C52) Bit# 1 (C51)
F_Bit Mask
[16]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
7
F Bit Mask[23]/UDL
Bit # 6 (C63)
TYPE
R/W
DESCRIPTION
Transmit F-Bit Error - Bit 24/UDL Bit # 6 (C63):
The exact function of this register bit depends upon whether Bit 7
(TxOHSrc), within the "Test Register" (Direct Address = 0x110C)
is set to "1" or "0".
If "TxOHSrc" = 0 - Transmit F-Bit Error - Bit 24:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to transmit DS3 frames with an erred F
bit.
This F-bit corresponds with the 24th F-bit, within a given out-
bound DS3 frame. The Frame Generator block will perform an
XOR operation with the contents of this bit-field and value of the
24th F-bit. The results of this calculation will be written back into
the 24th F-bit position, within each outbound DS3 frame.
The user should set this bit-field to "0" for normal (e.g., un-erred)
operation.
If "TxOHSrc" = 1 - Insert Enable for UDL Bit # 6 or C63 bit:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to externally accept an overhead bit and
insert it into the "UDL Bit # 6 (or C63)" bit-fields, within the out-
bound DS3 data-stream.
0 - Configures the Frame Generator to externally accept and
insert data into this overhead bit-field.
1- Configures the Frame Generator to NOT externally accept
and insert data into this overhead bit-field.
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